231. Which of the following is known as salt peter ?

1. 1. NaCI

   
   
   

   2. KNO₃

   
   
   

   3. Na₂CO₃

   
   
   

   4. NaHCO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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232. Match the List-I (compound) with List-II (chemical name) and select the correct answer using the codes given below the Lists
     

     	List-I (Compound)		List-II (Chemical name)
     F.	Bleaching powder	1.	Calcium oxychloride
     G.	Gypsom	2.	Calcium sulphate
     H.	Marble	3.	Calcium carbonate

     Codes

     	F	G	H
     A.	1	2	3
     B.	2	3	1
     C.	1	3	2
     D.	2	1	3

1. 1. A.

   
   
   

   2. B.

   
   
   

   3. C.

   
   
   

   4. D.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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233. Calcium decomposes cold water into

1. 1. Ca(OH)₂

   
   
   

   2. CaH₂

   
   
   

   3. O₂

   
   
   

   4. CaO

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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234. On heating CaO with C, we get

1. 1. Ca nd CO

   
   
   

   2. CaCO₃ and Ca

   
   
   

   3. CaC₂ and CO

   
   
   

   4. CaC₂ and CO₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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235. Which of the following metal ions plays an important role in the muscle contraction ?

1. 1. Na⁺

   
   
   

   2. K⁺

   
   
   

   3. Mg²⁺

   
   
   

   4. Ca²⁺

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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